

const TypeEnum={
    A:"a",
    B:"b"
}
const num = 100
function testA(a,b){
    console.log("this is ",a)
    if(!b){
        return 0
    }
    return b+10
}

function testB(...arr){
    let param=''
    arr.forEach(element => {
        param+=element
    });
return param || null
}